Abstract
The invention describes a sleeve for sliding onto and removing from a winding shaft, which comprises a one-piece workpiece defining a cylinder, which workpiece comprises two edge regions each having an edge, the edge regions overlapping one another, the sleeve having a first diameter in a relaxed state, the sleeve in a clamped state having a second diameter which is different from the first diameter, the sleeve in the clamped state experiencing an elastic deformation as compared to the relaxed state.
Claims
1. A sleeve for sliding onto and removing from a winding shaft, which comprises a one-piece work piece defining a cylinder, which comprises two edge regions with one edge, respectively, wherein the edge regions overlap one another, wherein the sleeve has a first diameter in a relaxed state, wherein the sleeve has a second diameter in a clamped state, which deviates from the first diameter, and wherein the sleeve experiences an elastic deformation in the clamped state compared to the relaxed state.
2. The sleeve according to claim 1, characterized in that the edges run in parallel to the main axis of inertia of the sleeve.
3. The sleeve according to claim 1, characterized in that the edges run helically to the main axis of inertia of the sleeve.
4. The sleeve according to claim 1, characterized in that the material of the sleeve comprises carbon fiber reinforced plastic.
5. The sleeve according to claim 1, characterized in that the material of the sleeve comprises at least in part steel.
6. The sleeve according to claim 5, characterized in that the material of the sleeve comprises at least in part spring steel.
7. A winding device with a winding core and a sleeve for successively winding of material web sections to form reels of material, wherein the reels of material have direct contact with the sleeve, wherein the material webs are displaceable relative to the sleeve, and wherein the sleeve remains in a fixed position during the displacing of the reel of material relative to the winding core, characterized by a sleeve according to claim 1.
8. A method for successively winding of material web sections to form reels of material, wherein sleeve is being or is arranged on a winding core while the sleeve is in a relaxed state with a first diameter, the sleeve is transitioned into a clamped state having a second diameter, wherein the second diameter is larger than the first diameter, the material web section is wound onto the sleeve to form the reel of material, the sleeve is transitioned into the relaxed state, again, and the material web is removed from the sleeve, characterized in that the sleeve comprises a one-piece work piece defining a cylinder, which comprises two edge regions with one edge, respectively, wherein the edge regions overlap each other, wherein during transitioning of the sleeve from the relaxed state to the clamped state, the distance of the edges is reduced.
Description
(1) Further advantages, features, and details of the invention follow from the below description, in which several exemplary embodiments are explained in detail with reference to the drawings. In doing so, the features mentioned in the claims and in the description can be essential to the invention individually by themselves or in any desired combination. Within the scope of the entire disclosure, the features and details which are described in connection with the sleeve according to the invention obviously also apply in connection to the method and/or the apparatus according to the invention and vice versa, respectively, so that individual aspects of the invention can be or are referenced mutually reciprocal with respect to the disclosure. The individual Figures show in:
(2) FIG. 1 a coreless winding shaft according to the prior art
(3) FIG. 2 as in FIG. 1, but with control elements displaced outwards
(4) FIG. 3 cross section of a winding shaft with a sleeve according to the invention in the relaxed state
(5) FIG. 4 as in FIG. 3, but in the clamped state
(6) FIG. 5 perspective illustration of the essential components of FIG. 3
(7) FIG. 6 perspective illustration of a further embodiment of a sleeve according to the invention
(8) FIG. 7 an embodiment example of a winding shaft arrangement provided with a fixating element
(9) FIG. 8 an embodiment example of a winding shaft arrangement provided with another fixating element
(10) FIG. 9 a winding device according to the invention
(11) FIG. 1 shows a cross section through a so-called coreless winding shaft 1 according to the prior art. The actual winding shaft can be discerned, which comprises a load-bearing pipe 10. The load-bearing pipe 10 is surrounded by a plurality of jacket parts 11, which in their entirety surround the pipe 10 preferably concentrically and, in the relaxed state, can abut on its outer diameter. Via control elements 12, of which at least one is associated to each jacket part 11, the jacket parts 11 can be displaced in radial direction of the load-bearing pipe 10. In order to be able to displace the control elements in a uniform manner and simultaneously, at least one force provision device is provided which is formed as an expanding cavity, for example a hose 13, in the present FIG. 1. By pouring in a pressurized fluid, preferably air, this cavity can be expanded in the radial direction thus pressing the control elements outwards, which is clarified by arrows 14. The state, into which the control elements are displaced outwards is represented in FIG. 2.
(12) FIG. 3 shows a first embodiment of a sleeve 50 according to the invention in a cross-sectional view. Said sleeve can be slid onto a winding shaft, which also comprises a load-bearing pipe 10. Within the load-bearing pipe 10, control elements 12 and an expanding cavity 13 are also provided, the structure and function of which are analogously to the prior art. Features which were described in connection with FIGS. 1 and 2 can therefore be combinable with features which are described in connection with FIGS. 3 to 6 or are shown by means of these Figures. The sleeve extends in the circumferential direction around the load-bearing pipe 10, wherein the sleeve is at an angle of more than 360?. In other words, the edge 51 of the sleeve abuts on the outer circumference of the sleeve 50 and the edge 52 of the sleeve abuts on the inner circumference of the sleeve 52. Put yet another way, the sleeve 50 overlaps itself in an overlapping area which is represented by the double arrow 53. In this relaxed state, in which the sleeve 50 can have touching contact with the load-bearing pipe 10, the sleeve 50 has a first diameter D1, wherein it is to be noted that due to the overlap the sleeve does not have an ideal round cross section.
(13) FIG. 4 shows the arrangement of FIG. 3, however with control elements 12 displaced outwards in radial direction of the load-bearing pipe 10. The displacing of the control elements, in turn, proceeds as in the prior art. During displacement of the control elements, the parts of the sleeve, which lay on top of another in the overlapping area, move relative to one another. In other words, the edges 51 and 52 approach each other, or, put another way, the overlapping area 53 is or is being decreased. In this clamped state, the sleeve 50 has a diameter D2, which is larger than diameter D1.
(14) Upon reaching the clamped state, the winding process can start, and a reel of material can be formed from the sleeve 50. If a reel of material has been finished and now has to be removed from the sleeve, the sleeve 50 has to be transitioned again into the relaxed state according to FIG. 3, in which diameter D1 of sleeve 50 now is smaller than the inner diameter of the reel of material.
(15) FIG. 5 shows a perspective illustration of a load-bearing pipe 10 and of the sleeve 50 slid onto it. It can be discerned that the edge 51 extends in parallel of the main axis of inertia of the sleeve 51, which extends near or on the axis of rotation of the winding shaft and thus the load-bearing pipe 10.
(16) FIG. 6 shows another embodiment of a sleeve 50 according to the invention. The illustration is also perspective. In deviation from the embodiment according to FIG. 5, the edge 51 (and thus also the edge 52, which is not shown) does not extend in parallel, but at an angle to the main axis of inertia of the sleeve 50. In other words, the edge 51 extends helically. Preferably, the circumferential angle of edge 51 is more than 360?. Also present but not shown in this embodiment is an overlapping area. The characteristics according to which the edges approach one another or the overlapping area decreases to transition the sleeve from a relaxed state into a clamped state, also remain.
(17) In order to avoid an axial displacement of the sleeve 50 relative to the load-bearing pipe 10, at least one fixating element can be provided in an advantageous embodiment which element decreases said displacement or even prevents it. This is of particular importance if a finished reel of material is to be removed from the sleeve. In doing so, the possibility exists that the sleeve is displaced inadvertently. For an automatic change of reels this would require an additional engagement in order to fittingly place the sleeve again. FIG. 7 shows a first embodiment which provides a pin 20 arranged at the load-bearing sleeve, wherein the pin represents the fixation element. In doing so, the sleeve 50 has a complementary hole 60, into which the pin can engage. In order to facilitate a sliding onto the sleeve 50, pin 20 can comprise a feeder slope 21 or be movably arranged at the load-bearing pipe. In the embodiment according to FIG. 8, a ring 22 is provided which can be slid onto the load-bearing pipe and fixated there. Said ring can now carry the fixating element. Such a ring can also be part of a fixating element. The advantage of this embodiment is that the ring can also be removed again, so that the winding shaft can be used with conventional winding sleeves which remain connected to the reel of material after winding. In the present embodiment, the fixating element can be designed as a screw 23 with which the sleeve can be pressed against the load-bearing pipe.
(18) A sleeve according to the invention and a winding shaft explained within the scope of this description, together can form a winding shaft arrangement according to the invention.
(19) FIG. 9 shows a winding device 100 according to the invention, which comprises a winding shaft arrangement 101 according to the invention. Via at least one master drum 103 a material web 102, which is for example a plastic web, can be fed to a contact drum 104. It is preferred if the material web 102 can be pressed against the winding shaft arrangement by means of the contact drum. The winding device is structured and operated in a way that the winding shaft arrangement rotates in the direction R. If a new beginning 105 of a material web 102 is fed to form a new reel, it is advantageous if the beginning 105 seen in direction R is applied to the sleeve shortly behind edge 51. By shortly is meant an angular area of 0 to maximal 30 degrees. In this manner, pitch 51, which results from edge 51 but also the pitch which results from the beginning 105, is decreased.
